I suspect the reason people don’t kick out politicians anymore is increasingly its difficult to do. This seems to be a fairly reasonable interpretation of the above data too. In the past politicians were unseated more frequently leading to shorter average terms. Now they’re rarely unseated leading to longer terms.

Seats aren’t contested enough because of the massive amount of party support or funding required to beat a sitting person. And we’ve seen how these two parties are corrupted and need to care less about the public opinion now. Less options means less choice for voters to do what you suggest.[1]

Of course I think the real solution to that is election reform with single transferable vote (STV).

[1] though we seem to be seeing some backlash in the past year against this such as with the Justice Dems movement.