In the end anything is possible. I think that you may want to look as some type of abstraction to the process; like SubSonic at CodePlex, etc. But my spider sense would wonder if the manager knows of some kind of buyout or something. Remember what sounds good in marketing does not always work well in like. So, if he can say that the database is agnostic then that’s a selling point. My suggestion - look for something that will make your like easy and fulfills your managers demands and at the same time update your resume.