actually, it sounds terrifying, but on practice it is much more easier. because:

1. very seldom people need to speak different dialects at the same time, unless you travell, for expl, from sudan to lebanon every month.

2. though standard arabic is very hard, spoken is really easy. i mean, grammar. for example, it's easier to learn spoken arabic, then spoken russian, though  standard russian is much more easier then standard arabic.