To each his own, but for me, that bridge pickup totally ruins the whole look.
I considered going single pickup, largely because there is so much love here for that configuration. I decided against it, obviously. Here's the thought process:
Generally speaking, I like to play near the bridge, and the bridge pickup is where I typically anchor my thumb. In addition, the single pickup sound tends to be a little "wider", with less focus. I own only one "traditional" (single pup) P-Bass, and I tend to tire of the sound and start hankerin' for a bridge pickup after playing it for an hour or so.
With regard to the look, the first Thunderbird I ever saw was a two-pickup, and as a result the one-pickup models always look like they are missing something - but that's just me. Actually, I do have a 70s Japanese "Aims" brand P that only has one pickup (the original pup was one of those Maxon deals that Ibanez also used). The remaining Chinabucker I have would probably drop right in. It has one of the guitar-sized TB Plus units in it at the moment, and I could probably find a better home for that.