[LeoPanthera]

InSight is a non-mobile ground station, not a rover.

The rovers can position themselves such that wind removes dust.

[mortenlarsen]

So it only needed a "turn-table" base?

[LeoPanthera]

I'm sure it's not that simple, but I suspect that it simply isn't worth it to launch extra mass to Mars. InSight was successful in its mission, I don't know what value would be gained from extending its life further.