I'd have the scope. The doc may want it to pave the way for you to move to a biologic. Your sig says you are "elderly"* .. I don't know what the rules are regarding moving to biologics if you are on medicare.
But even without the biologics consideration, you have had ongoing inflammation for 9 years. Long term inflammation can contribute to colon cancer. Even though all your previous scopes didn't indicate cancer, that doesn't mean the next scope won't. Your last scope was over a year ago and to me it sounds like you should be getting one every year at this point. 9 years is a long time with inflammation.
I've been freaking out being in a flare for almost 2 years now and am having a scope at the end of September. Previous scope was in June 2018. I don't know how many I have had since I was diagnosed 6 years ago, but I would guess it's probably been about
5 already -- 1 when I was diagnosed, 3 when I was flaring (including 2 within 6 months of each other when I went for a 2nd opinion) and 1 when I was in remission on Entyvio..
No one likes scopes, but with this disease it's a necessary evil
*If elderly means you are in your 80s there could be other considerations for avoiding a scope. Talk with your doc.