On an ecological level tourism is a bad thing yes. Now maybe it'd be good for the economy or whatever but I don't think making $ should be the priority. Plus Luxembourg isn't really in need of money.
The only point of comparison I have is amsterdam and people are definitely flying/road tripping there for short "drug vacations" (I genuinely think everyone I know has been there at least once for that purpose), which in my book is not so good for the environment and a more than debatable reason to fly/drive hundreds of kms.