at least in the developed world? Any recent studies out discussing getting rid of this thing similar to measels, polio, etc? If enough hosts are immune or immune enough do we stand a chance to get this ******* out of existence?

No. The only pathogen that has been eradicated is smallpox. And that took decades and a highly coordinated worldwide effort. Smallpox had a much higher mortality rate than SARSCOV-2. (as high as 30% for small pox vs. 0.1% of COVID.) so there was much more of a necessity for smallpox.
It will just be an endemic disease that will be in the background with many other pathogens that societies deal with.

I would guess no due to it being an RNA virus (more likely to mutate) + the low mortality rate decreasing the political willpower to get everyone vaccine.

I do believe it is possible, I mean we almost have polio killed and it is a respiratory RNA virus. I have yet to see a cost per dose for any COVID shot but I gotta think it is much more expensive than polio vaccine.