I think the premise is a bit off, which is that Pathfinder and D&D 5e are mutually exclusive - not just the purchasing of products, but the usefulness across games. Enterprising DMs use material from a wide variety of sources, including different editions of the same game. I would think that if 5e turns out to be what they intended from the get-go, adapting Pathfinder material for a 5e game will be relatively easy.
Tabletop gaming is not only a hobby of play, but for quite a few, also a hobby of collecting. Not to mention that many gamers cross-pollinate with different games, especially different versions of the same game. And yes, there are folks who buy both Paizo and WotC product, and use both in their D&D game.
I'll use myself as an example. I played 3e until 2003, when I took a five-year or so hiatus from active playing and didn't start up again until 2008, after 4e came out. I played 4e for about four years and haven't played in almost a year, but am starting up a 5e campaign in January. I don't play Pathfinder because it is too much like 3.5e, and I prefer a simpler game, and one not so focused on system mastery. That said, I buy Pathfinder products selectively - mainly Golarion setting books, but also a few adventure paths and hardcovers - because a) I like Paizo and think they make a great product, b) I enjoy collecting setting books and Golarion is the most in-depth ongoing setting in the biz right now, and c) I want to mine their products for ideas for my own campaign, even considering adapting Runelords or Shattered Star for my 5e campaign.
The larger issue, though, is the almost jingoistic nationalism that is exhibited in your post, ForeverSlayer - as if we have to pick sides, and as if there is some kind of merit or pay-off in actively trying to put WotC down and turn people away from 5e. This is akin to trying to win the battle without any awareness about the larger war. The battle is WotC vs. Paizo; the war is the health of the hobby, in paticular D&D. I'm guessing (or hoping) that the folks at WotC and Paizo realize that the battle actually negatively impacts the war, and thus both are rooting for each other.
I realize that there are a few embittered folks who will hate anything WotC comes out with, but I'm fairly certain that the majority of gamers will at least give 5e a look, and are interested in the health of the community and industry as a whole.
I think Paizo will do just fine, although I would be surprised if they aren't accounting for a slight dip when 5e comes out in terms of their active player base. The simple fact of the matter is that Pathfinder is a rules heavy 3.5 variant, and that isn't every D&D player's cup o' tea. I'm guessing that some Pathfinder players aren't in love with the system itself, but play it because 4e isn't being developed anymore, and/or they like Paizo, or any number of other reasons. This isn't to put Pathfinder down at all, just to say that it speaks to a relatively specific crowd of D&D players.
But there are also a larger number of Pathfinder enthusiasts who wouldn't switch back to D&D even if 5e was a revised 3.5e, and there are probably quite a few who will keep their subscriptions, even if they buy 5e books and give the game a shot. But any loss in players to 5e in the short-term will, in the long-term, be offset by 5e being a quality game. Dungeons & Dragons is, and likely always will be, the flagship for tabletop RPGs. If D&D is healthy and thriving, then chances are the industry as a whole is healthy and thriving. Actually, 5e being a smash success may actually benefit Paizo in the long run.
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Morrus , there are small rodents on Alpha Centauri? Link, please.
