not buying current books which hurts the profits of WOTC and Hasbro making it less likely that they will continue to publish D&D materials.
This guy sounds like a zealot. Wotc/Hasbro gets my money when they offer products I want to buy. I'm not in gaming to support WotC or to support the health of "the market" or "the industry." I'm in gaming to have fun. I buy what I like, and I play what I like.
fragmenting the hobby. When everyone plays the same edition and plays it by all the books, it makes it easier for players to find games. The more people refuse to upgrade to the latest version every few years, the more fragmented the hobby becomes and the harder it is to find players.
More zealotry. Again, I "upgrade" if I like the changes. I don't upgrade to "support the hobby." Frankly, I don't really care if the hobby grows and is "unified," or not. I'd be perfectly happy with a smaller, more hobbyist market. What concerns me is having fun with my gaming. I've never had a problem finding players, so that's just not an issue, to me.
Also, I think diversity in the hobby is healthy. I think the market is healthiest when it's driven by competition and purchases. The market adjusts to the needs and desires of the consumers; that's healthy. Trying to force everyone under one banner is just silly, IMO.