The Chilul Hashem was made by the non-Jewish provocateur who went on the bus just to expose something that the passengers wanted and agreed to based on the perfectly valid views of their rabbonim. This bus has been that way for 20 years and no one complained. That provocateur is no better than the Dutch moiseres who told the Nazis where the Frank family was hiding. She would have done the same in those circumstances.
99% of the passengers who use that bus are frum Yidden. The other 1% are probably cleaning ladies who depend on frum Yidden for their daily bread.
Had someone done the same to expose an African-American practice, everyone would be crying “racism.”
In the end, passengers will continue to sit as they did. Glares and stares from passengers will make those who want to make trouble feel uncomfortable. The drivers just won’t be able to enforce anything.
Alternately, the company will ditch the franchise and the new operator or the MTA won’t make a penny on it because the old operator will get all the Jewish business. The new one will make do with the occasional Polish cleaning lady who lives in the Polish neighborhood on the outskirts of BP and cleans homes in both BP and Willy.