Well the official reply to why they stopped making them was that tooling had to be replaced and the marketing thrust for retro's was deemed to be the Bonnie which had a larger following in the US, by tradition.
Parts for the TB class, Adventurers and Legends are readily available, at least I've never had any problems, wear and tear parts are pretty common with other bikes in any case. Not many riders give up their TB's and those that do seem to miss them.
It all depends what suits you, looking at TwinVee2's request the TB to me was the bike for him, despite his monicker !
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Ride on !
