I dont think your sentence makes sense. Are you asking if Brexit happened, then would it be harder for EU students to obtain funding for UK unis or in this case Warwick? If Brexit happened no current students would be prejudiced, beither would any who are students during exit negotiations. Exit negotiations could take 2-3+ years They will put something in place after that, whih might be on a bilateral basis i.e between two countries.
The problem with making things difficult for foreign students is that the other EU country will make it difficult in kind for UK students. I dont see things being ade more difficult and any changes will be years away.
At the moment its likely to be a remain result, although I dont think people in the EU realise how unhappy many from the UK are.