The last confirmed data had the game under 300k after the first week (no exact figure, but 300k was the max possible, it was likely close to that). By comparison
SFIV and SCIV were over 2.5mil worldwide
BB did over 1mil worldwide.
Capcom probably made the most money, Aksys best return on investment. Both companies deserve it. Namco probably made good money on SC, and lost a good bit on Tekken 6. SNK definitely lost big on KOF- the question is do they stay in, or stick to what they're good at now, which is witch touching games and pachinko.
Tekken 5 sold millions, but many were greatest hits sales.
Really, 3 was the commercial peak of the series, it's been downhill ever since (excuseable in Tag's case as a launch title)
Will the next Tekken get a console release is a legitimate question. I bet Tekken in the arcades also will peak at 6, just like how VF peaked with 4.