Remember though, you don't remember the money you have in the bank on your death-bed.. Life is for living, go live it.
They're early 30s, hardly likely to clock it anytime soon

Probably want to put themselves on the best possible footing for later on, by which time they'll be well ahead of similar families who have redecorated and kitted the house out three times over but have little in savings.
Of course, some kind of balance is probably best overall. Being asset rich is very powerful though, many people under estimate it!