Currently I think that is the case. Brexit is still a massive obstacle, whoever picks up the baton now has financial issues, trade issues, NI to deal with. Also the malaise of government Ministries over the past 5 years. It's all a bit stale and needs reinvigorating. Normally the Tory Leadership election would attract the best MPs they have. Not now. That is a concern.
UK politics probably did attract better people in the last century. Now, the power-hungry end up as MPs. There are many many exceptions and most MPs are very decent, relatively hard-working, and competent. But are they visionaries? Do they have much of an understanding to be in a cabinet and lead the nations? Few who have such credentials would subject themselves to public office I think. Instead they'll earn far more, and have a freer life.
It is just one area of UK politics that needs fixing imo.