Not really. Sun would have survived and thrived if it had thrown its weight behind Solaris x86. But they were too worried about cannibalising SPARC and when commodity kit started to beat them on price/performance they had nowhere to go.
I remember when we ripped out our 3 6800s and replaced them with 9 Dells, for way more power at a fraction of the price. Would have loved to recompile on Solaris, but the hardware savings easily covered the cost of a port...