From what I remember, the base respawn is only ten seconds with an addition of six seconds for every tribute you own. So yeah if one team gets wiped it can be bad, but I would imagine given they have a speed nerf when carrying the tribute, even if they get all three home, you should be there within the 45 seconds of win confirm time, though if you can manage a steal within the time with the boosts they have that is another question.
Well we'll find out soon enough, the PTS started today with the Tribute testing.
You actually make a really good point, but I'm hoping things like wiping in the first clash forces people to think tactically. Like maybe for ****ing once in their lives, Heavies will stay at the base and protect the important bits.