Welcome to the boards. Great thread you started here. Personally, I think that the limit on too much travel really varies from time to time, time being personal life circumnstances, cycle of the industry you are in, etc. There are times where you have to travel more than you would like, and there are only so many things you can do to limit that. However, are VC's and other technical means become more mainstream, I think that many companies (and their clients) are going to start curtailing massive business travel.