Usability say

How much say a Usability expert should have in product development? And if the management is least bothered about the Usability issues then what?
It's not how much "say" the usability expert has, it's the influence they have on product strategy. For the most part, the usability industry has done itself a disservice by insisting it should be the gatekeeper of good design. Instead, design professionals should make their methodologies more visible and consumable for all company stakeholders. If management is "least bothered" with usability, it's because the benefits have not been communicated in a way that is relevant to them. Example: talk about processes that reduce development cycles, measure the before / after of customer satisfaction, analyse the usability-related costs of support and training, compare your product's e-quotient wity that of a competitor.... In other words, put it in a business context - managers don't care where you place the pixels!