Personally it sounds boring.
What I'd really like to know is what is the problem that needs to be solved by this change?
The problem Is that during the Years people got bored and left the game, something most be done time to time to renew a bit and try make It more interesting....
Another point in my opinion in favour of train different players Is that in this way really people can experiment something new, about how to train and also maybe try new a bit unusual skillset.....
Of course also now you can do It if you want , but you really think that people take 2 or 3 real Years for make and experiment? If people could train One "crazy skillset" player and two "traditional" ,more of us Will try something new, and new type of players in the game Will make It more interesting
Anyway if train different bore you, you can Always go on to train like now the same thing for all trainee..... Than if you train pot 6/7 Is not exactly training that keep you here