There's nothing wrong whatsoever in any person playing whatever version of D&D they prefer. If folks do not pick up 5E24, that's no big deal. WotC doesn't even care that much on an individual level, as anyone who sticks with 5E14 will probably still pick up the occasional product from either the 5E14 or 5E24 lines, or additional products from DMs Guild... meaning that those people are still customers of the D&D brand. And who knows... eventually they might also decide to splurge the $180 for the three new 5E24 books too if enough other players around them wish to play the new revised game and they want to join them.
At this point... the strategy of Wizards of the Coast seems to be not trying to convert current roleplaying game players of other games over to their new rules, but rather convert non-RPGers into roleplaying gamers (because they will most often than not find their way in through D&D and become D&D fans). It's the other RPG companies who then try to convert current D&D players into whatever other roleplaying game (D&D variant or no) they are putting forth. But none of them really have the financials to try and convert non-RPGers directly into Tales of the Valiant players (for example).
The big company can go through all the money and effort of bringing in entirely new customers... the smaller companies can then convince them once they've arrived that perhaps they might prefer a different version of these games or two.