Yes, that's one of my concerns too. I saw an interview with Russell T Davies (the writer and brains behind the relaunch seasons since 2005), and he went into some detail about how the programme has to change to reflect changes in modern society. Hence recently we've had a female and now a black Doctor (I'm not even sure if I'm allowed to use the word 'black' these days). I wouldn't mind too much, but I didn't enjoy Jodie Whitaker as the Dr, and I'm not hugely impressed by what I've seen of Ncuti Gatwat so far. There's always been an element of humour and even silliness in Dr Who, but there's a fine line between silliness and crass stupidity.
My favourite 'old' Dr was Tom Baker, and my favourite 'modern' Drs are David Tennant and Matt Smith.
I don't remember ever seeing Sylvester McCoy thankfully; no wonder the programme disappeared for 16 years after him. There was a brief appearance by Paul McGann in 1996 in a feature length episode, which apparently was well received here, but was intended to break into the US market, which it failed to do, so it was dropped. Never saw the 1996 version, so I'm downloading it now (from PB).