Well, I suppose that if you are using tubes to provide a tonal cure to a problem with other components or set up and keep buying stuff that errs substantially on the warm side of the spectrum, it could be a problem.
But, if you are trying to get that mid-range/high end naturalness (call it airy, bloom, whatever) without emphasis on a certain tonal balance I don't think you can over do it. The great thing about tubes, though, if you wish to change the tonal balance a tad, all you need to do is change tubes. A few bucks. With SS if you wish to alter the tone, such as excessive brightness, or some such illness, you either have to buy new components (with tubes :-)), or signal bending cables and IC's.
Obviously thats just the opinion of a person who has found tubes optimum for his ears and can overlook their short comings. I keep two SS amps on the premises just to remind me on those days when I feel anxious.
But, FWIW, you don't need a tube tuner, I'm not so sure about a CDP/DAC, and I wouldn't be without a tube phono stage and preamp. Amps and speakers should be matched and tubes aren't really an absolute necessity with many speakers, in fact they may not be optimum at all with quite a few speakers.