Good move. As VDS`s understudy Foster would have got only a handful of EPL games, as number 1 at Watford he will get plenty of experience. A loan also gives utd more money to spend in midfield and up front.
I don`t think either Steele or McShane - whose move to wba is part of the deal - had long term futures at utd, indeed McShane was alerady up for sale and Steele was at coventry on loan. I hope they both go on to have a successful career at wba.