While I understand the hand-wringing over a successful free weekend, which is a big deal for this particular game, I personally think it is bad form to reduce features, especially for the sake of only 10 ms latency. 30-40ms is starting to seem significant, but 10?
I should say that again. This is purportedly for the sake of only 10 ms latency. I hate to say I think Mekhazzio is right the elephant in the room is hit detection for which 10ms is thought to be a significant enough improvement to the overall experience that cutting features is considered. Don't get me wrong. I'd love to play RO2 as it is with 0 latency.
Another elephant that only Ramm mentioned is client performance (fps). I can understand that a slight boost to fps for a first impression might be a hypothetically good idea. But again, it's cutting features for the sake of a slight gain.
My idea, probably not as simple as I think, is rather than enforced max player limits, for TWI to implement a "TWI recommended server" program/feature where servers can apply to be benchmarked for official "recommended" status ("recommended," of course, with the disclaimer that user experience may vary). Make a one character column in the server browser for the little medals/symbols (a star, or something like that) that will indicate recommended status so that players can sort the list by recommended status. You could also have an in-between status for "recommendation pending". For the free weekend, introduce a splash tooltip that recommends new players to the recommended servers and to choose one with the lowest ping for them. Servers that get awarded this status can also generally toot their own horn in their names/descriptions/welcome screen to attract players. TWI can even decide --for the free weekend-- to only recommend 50 player servers if they really don't feel comfortable.
Another idea: Maybe start a campaign appealing to sever admins to lower their max player count voluntarily on the free weekend. Tell them it's for the good of the community and therefore, ultimately, their server as well. And if they want to they are heartily encouraged to go back up to 64 after the free weekend.
Maybe limiting the max players is a good idea. It seems to be a popular one, if you combine the hard and the compromise options.