Whenever Opportunity takes its last Ampere, it will do so after accomplishing several magnitudes more than it was designed for.
Would not wonder one bit if this tank of a rover keeps going another couple of years.
It'll be fine :D
For human installations, "astronaut with a broom" ticks all the necessary boxes.
First chore of the day for the future children of Martian farmers.
I wouldn't say solar power is obsolete for Mars rovers/landers. As hit has been said before, this isn't a mission which is failing due to bad solar panel technology, this is an aging rover met with extremely harsh conditions after working 15+ years longer than it was supposed to. Not only has its panels weared down, the batteries too. If it's lost in this duststorm, it's going to be sad, but not evidence that solar power is a no-go for martian exploration.
 see all the "what if it explodes at launch" stories from MSL/Curiosity like https://www.livescience.com/33609-curiosity-launch-plutonium... -- Cassini went through pretty much the same before launch
 Mars 2020 didn't pursue this because they were trying to reuse as much R&D as possible from MSL/Curiosity, so it stands to reason they'd use the same power source (or an updated version of). Edit: the RTG for M2020 is a spare part from MSL -- https://en.wikipedia.org/wiki/Mars_2020#Design
A further ramp-up of Pu-238 manufacturing is not inconceivable, but with PV cells that can operate usefully in Jupiter orbit, we only need Pu-238 for outer planet missions and some specialized purposes (e.g. a Mercury lander that spends a lot of time in complete darkness, or a truck-sized Mars rover).
Afaik lot of people told the NASA and ESA to build Armored robot ... Do you go in slip at works ?