Isn't anyone worried that we might potentially have a new GK, rightback, CB, two midfielders, winger and striker in our starting line-up next season. That's not an ideal thing, it's almost like another season in transition.
Let's hope LvG has some kind of killer, supercharged bootcamp in pre-season lined up to make them gel and learn his philosophy.
It's more ideal to have good quality in place that needs bedding in than it does to have way lower quality (and quantity) than what is needed.
Signing a right back is needed as long as Rafael isn't trusted and can't stay out of the physio room. Valencia is neither a right-back nor a winger anymore.
We might keep Valdes, meaning that he has been training with the players for quite some time and he has played under Van Gaal before, not a big change except for the very big drop in quality.
We need a CB, we have 2 injury-prone first-third choices whom neither are top-quality (yet), and behind them we have Blackett who is far from ready for even a backup spot, McNair who is a good backup and Evans who is a crawling dissaster. We definitely need a CB of top quality.
We currently have an aging Carrick who is also gotten more injuries, he is a key-player who will need replacing, either by a backup to Blind or a top-quality player. Having only one player to fill in for Carrick here is a issue. (Personally I don't think we need 2 midfielders, we need 1 and could get away with bedding in Pereira)
Depay is already signed, and though it on paper might not have been needed, he is a top talent and with Young aging, Di Maria not settling in (or deemed a winger for LvG yet) and Valencia pretending to be a right-back we only have Januzaj behind them who is more miss than hit.
With the system more set, Depay offering goals from the left, less injury issues and a proper defense and backup for Carrick, our attacking lineup will be fine without a striker, even if it ends up with us having Rooney, Chicharito and Keane as our alternatives.
Of course I'd love to add another striker, but failing to do so won't be a big issue if we can get a better platform for them to play on.
I get that you are worried about the amount of players that are potentially coming in, but the issue would be much bigger if we had to rely on a back-line of Blind, Blackett, Evans and Valencia, with a midfield where Herrera is our best defensive-contributor (and creator).