Depends on your plans. If the engines and saildrives are in good condition, i.e. no smoke, easy starting, saildrives not corroded and no mechanical faults, they should go on a few more years, particularly if you are not planning a major trip to remote
areas. I am guessing it's an ex charter boat
to get those hours, so the machinery will have been worked hard and regularly, and provided they have been maintained regularly and properly, they should be good for more life.
If you have doubts, then the issue is whether to refurb
or replace. I would guess judging by the price
of VP spare parts
and the cost of labour, a major refurb
of the drivetrain would cost more than buying
2 new and as you say the labour for replacement would be far less. There will be a market for the old engines/saildrives as well. Unless you replace everything, you will still have potential issues with things you have not replaced wearing out.
We purchased a FP Athena in charter
that had 6000+ hours on the 2 yanmar
GM20/SD20s. They were running well and we got a couple more years charter before we replaced them with Yanmar
3YM20/SD20s ready for when we left charter. The cost in 2012 was 22000Euros inc labour in Croatia