Yes, I believe writing a book can help. I do believe how it is published does have some bearing on its legitimacy overall. If your book is through a major publisher, it is going to hold more weight then something that might be self-published. That’s not to say that is self-published book doesn’t contain excellent information, but you have to realize the majority of people aren’t going to read more than the first chapter of your book, and its cachet with them lies in how it was brought to market.
In 1999, I was working for a software development consultancy in Minnesota. The president of that group was asked by Oracle Corporation to write one of their books, specifically on web-enabled databases. This was a big thing at the time, in very few companies have the competency level that we did. Any time that we went out to pitch business, we dropped off a copy of our book on the desk of the CEO for CIO of the company. We had no expectations that the book was going to be read, but it was a lot better than dropping off a few sheets of sales lit in a folder. We didn’t win every pitch, but for the Midwest we would consistently put in shootouts with companies much larger than ourselves, including some of the big accounting firms.
Assess the situation, see what your publishing options are, and then make that decision.