Speaking of Thanos I am rather curious what the plan will be if the titan gets his hands on all Six Infinity Stones?
They made it perfectly clear that no mortal can withstand possessing their powers...multiples times in fact. So unless they form a massive conga line with Star Lord wearing the Gauntlet I am curious what they are going to do for Infinity War
Well we know one powerful being can withstand holding one stone, and they can cram it into one of their inanimate weapons if they like. So it's possible to buffer them to a degree. I'd imagine the Gauntlet is the mother of all buffers and the one wielding it can survive the use of all six gems and control reality. Otherwise what's the point of the Gauntlet, why not just get the stones and the Gauntlet be damned?
I still think it's way too soon to be messing with a story like this, though. Not one of the Guardians is really strong enough to tangle with Thanos (possibly Groot, if in full condition and in a conducive environment) and only Thor or the Hulk can hope to do that as part of the Avengers, with maybe Scarlet Witch if she controls her powers better, and Vision if the Mind Gem doesn't get ripped out of him and completely deactivate his body. Doctor Strange, possibly, and certainly Captain Marvel, but then you have to consider Thanos with one or more Infinity Gems in his possession, and that just makes the gap seem insurmountable, let alone with all six of them. So unless the goal is keeping them out of his hands rather than stopping him once he has all of them, I'd imagine lots of Deux Ex Machina type stuff going on that will make us walk out of theaters with conflicted looks on our faces.
Here's the other problem: It's almost a universal complaint that Marvel has weak villains. While that is pretty much true for the most part, Thanos does look pretty menacing so far, although him not getting up out of his floating chair until the post-credits scene of AoU does leave us scratching out heads and going, "Oh, you're just doing this NOW?" Plus he gave up one IS to Loki in the chance to acquire another, and ended up losing both. Not so smart. For a guy who supposedly wants to lose subconsciously, this still reeks of questionable boss-bad-guy-ness. If he's got minions who can stand against the united good guy forces, we haven't seen them yet. And we still need to spend time collecting the last two unseen Infinity Gems somewhere in the next couple of Phase 3 films. I just don't think there's going to be adequate time for character development before they trot out the baddest of the bad. Plus where does that leave us for Phase 4, or the TV universes?
They could put Phase 3 on hold as far as the Infinity stuff goes and maybe have a Secret Wars instead. This will truly push the Avengers to figure out the nature of good and evil as they are put to the ultimate test. The stakes are their own lives and their own survival, not simply for the greater good, which will force them to question their own motivations (Tony's self-interest and Steve's selflessness, but to the extreme). This would also set the stage for a real reconciliation after Civil War, the perfect thing for the conclusion of Phase 3 and go into Phase 4 with even bigger threats, leading more appropriately up to an Infinity Saga or whatever they'd call it (using 'War' in their titles is bound to get old by then). They will also meet each other and make introductions that haven't yet been made yet in the films, like new characters from Phase 3 getting to rub elbows with anyone they haven't gotten the chance to shake hands with. They will face their villains, and others' villains, to test their mettle against even worse odds. Leadership positions may be shaken and end up in others' hands. Weaker characters might get an upgrade (that is where Spider-Man found the symbiote, isn't it?)
That's my spiel. Something with more time for build-up. It's not like Marvel needs to play catch-up with DC and have their version of Darkseid make a splash before the real Darkseid shows up to threaten the Justice League, is it?