It would slow the game down because with 1 serve, players will just roll it in to start the point, fearing to miss and lose the point altogether and it will be 100% base line rallies. Players like Isner/Karlovic/Raonic would be playing in futures most likely.
With 2 serves, the possibility of player getting hot on serve exists (because of confidence he has that he still has second serve to hit) and winning service games in 1 minute which speeds up the match...Just watch some of Olderer's matches on grass from long ago when he got hot on serve. 1 minute service holds were a norm for him.
too good and too funny. i think you are right. some players would be struggling at the futures level if their big serve was taken away.
and again you are right: time saved with having just 1 serve would be easily negated by the fact that they will all be spinning the serve in to start the rally.
there were some who said that it would speed up the game but i also fail to see how it can happen. perhaps it could happen 40-50 years ago but not today.
**one thing we can do is have an exo or 2 where they are allowed just one serve and see how it goes.
if we can have a 1/2 grass and 1/2 clay court for an exo then why not experiment with some other crazy ideas also.