I don't have strong opinions either way on this without playing with it some, but I think saying this is going to cause more or less skill to be involved in the game is probably misguided. Though I definitely agree that the skills tested are different.
Trying to make educated guesses about your opponents unrevealed Pokemon was a dying skill that has won many matches over the years, but I think in the end it's just that - a guess. As the pool of potential Pokemon increases those guess/predictions are going to get even less accurate, so I'm not so concerned that information is going to be narrowed down at the beginning of the match. While that skill goes away, another skill I have noticed rapidly declining in many players is the ability to plan an end-game - that is, not just trying to randomly beat up the Pokemon on the other team, but to wear the correct holes in the opponents team to enable a set of conditions for your side to sweep up what remains. I think this skill being tested more isn't such a bad thing either; though I'm not sure exactly how people will react to knowing the risk/reward of their actions a little better. Might be less likely to sacrifice those Steels knowing absolutely your opponent has some Dragons waiting in the wings.
Pokemon is ultimately a game of gaining information and then using that information to try to create desirable situations for your team. Most of team building is trying to avoid those situations for your opponent(making a relatively balanced(or unbalanced, as the strategy sometimes is) team that is difficult to play against and set-up on) and creating them for yourself(offensive team strategy, creating opportunities for offensive Pokemon to come in and for sweepers to clean up at the end), which I think is tested even more now that the element of surprise isn't so much there - people are going to see giant holes if they exist, so best make teams that don't have them. The midbattle predictions are always the best in the first four generations, anyway, when you have enough information to make at least educated guesses/predictions rather than just throwing shots in the dark.
I'm reserving judgement until we see how this plays out, but it might not be a bad thing. Definitely interesting.