Not a problem. I and three others tackled the 5e version of it with no problem at... 14th?
I know wyrmlings don't have the punch that 14th-level PCs do, but there's not a huge amount of combat, frankly.
I will give TftYP people this: they didn't touch ToH too much but to re-stat things appropriately, so it's still much more about the player half of PC than it is the character half.