Lag has always been a problem. It's just something you have to get used to. What I think is unfortunate is that the fate of many games is determined largely by lag. This is especially true for league games, such as SCTFL, where it's not uncommon to have two clans from two different continents paired against one another. If you view the match report of two fairly even clans, you'll find that the clan who got to play on their server twice is usually the victor. I'd be truly happy if that could be fixed. But it probably never will be, and, as I said, one just has to get used to it.
You probably don't have to worry about lag becoming anymore "serious." Internet connections are constantly improving, so it's unlikely that we'll see the situation degrade to a point where the game is unplayable.