It would burn their best and most loyal customers. One of the most important things a business needs is 'goodwill/trust' which is why such a subjective thing can be counted in even on a balance sheet as a significant part of the value of a business. It would also hurt the trust of the developers and publishers and we can already see the damage the PS3 has caused them, with the PSP publishers and developers had blind faith but because of the PS3 they took a 'wait and see' approach and hence we have the situation where the Vita doens't have a great level of support so people aren't buying it which leads to poor support. If they dropped the Vita they may as well not release the PS4 it would put them at such a disadvantage against Nintendo/Microsoft.
Tease.
