abe chill yaar.....dont think this way..
from this year , bits has launched a new campus (hyderabad) ,so the no. of seats would increase and the cutoff would be low..so although u might not get anything at pilani but u can get msc at goa and hyderabad(or even a BE course)...
i am studying at bits-goa and i believe it is as gud as the pilani campus(actually pilani is better than goa right now but seeing the pace at which goa campus is growing , it would be among the best institutes in india by the time u get out..)
as far as msc dual degree is concerned , it is as gud as a BE degree..(if u want any details related to dual degree..let me know..)
so..if u really dont want to take 1 year drop , bits is definately a gud option.
try to convince ur parents (but do listen to their point of view also)
if u want any other details related to bits..ask me..