No there won't..... Most of them will still stick to BFL cause they believe (like really religious "batshitcrazy" people) that their holy savior ASIC will arrive soon. Even if there is another delay 
It's not as if they can "take their business elsewhere" at this point anyway. No-one in their right might would place an order with bASIC. ASICMiner isn't going to be selling to the public in the near future. Avalon is due to deliver their first batch soon but orders are closed for that. For BFL customers, the choice at the moment is to either hang in their or to get a refund and abandon the idea of ASIC mining for the immediate future (which they don't want to do because they'll be disadvantaged if BFL does deliver at some point - even if it's late - and they don't have an existing order).