Sorry, but I'm right in this instance. Heck, I'm talking to you right now from a CRT monitor and this small text is very sharp and crystal clear.
Every CRT in my house offers a very clear and sharp picture. Even a 30 year 11" black & white CRT that I've hung on to (It's what I started gaming on with my Atari 2600 back in the day) still offers a nice picture.
Older CRT's don't suffer from becoming blurry in huge numbers. I don't know what makes you think that's the case, but as a CRT owner and fan, there are countless other things that are far more problematic (Yet still fairly rare).
Capacitors going out is the big problem and one that is fairly easily resolved with some basic electronics skills (Just have to be sure you know how to discharge the electricity from the tube first). That's the problem owners of classic arcade games face and that's the problem the classic gamer is going to face down the road when things like late model Trinitrons start to develop issues and there isn't a ready supply of cheap, used, high quality CRT's from Craigslist and such to just replace one with.