Hmm....
Pardon me my English isnt that great but from what I understood from that article e3 is about to be solved not entire Antichess ? or is the rest already solved ?
until recently e3 had only 2 variations left unsolved, that means 18 out of 20 replies by black would end in a loss, and from what i understand now theres only 1 unsolved line left now by black against "e3" ?
Pardon me again but i dont understand your concern. There are 12 highly playable openings by white, and even if all of them are solved, even if there will be such a thing as "Watkins lines" as you say, that shouldnt be able to affect or ruin the fun for human players because there are many options for black per move, and i dont think any human is capable of memorizing every possible best move when there so many options for black to choose from.
this does not change anything for the game, memorizing lines will not help u when u are up against a strong player. Once i lose to someone in a certain line i immediately change my replies next time, it would take a genuinly strong player to truly beat another strong player not memorizing solved lines. Human capacity for remembering is limited so theres no real danger here, and the fun should continue.
I'll give you an example im quite inspired by, you see this player
http://en.lichess.org/@/f4opening hes devoted himself to an opening that is openly and officially lost, and yet even I at my best efforts could barely beat him, infact it mighta been a draw if he had not accepted my takeback.
like i said, until recently 18 out of 20 replies to e3 were lost by black, yet did anyone care ? nope, black players still kick whoites "winning" ass quite frequently.
we are only humans. This news doesnt affect our game or fun. But even if it did, we would find a way around it im sure, there are always options and different parts of something, you can enjoy.