Before DASH may benefit from Schnorr signature aggregation (tree sigs), it will have to implement segregated witness.
When is DASH getting SEGWIT?
DASH can't just stagnate while Bitcoin adds Schnorr sigs, SEGWIT, CLTV/CSV, RBF, sidechains, payment channels, etc.
It will be obsolete long before Evolution is done.
It will never happen. Bitcoin will always be behind. If you were not such a idiotic schill you could have seen what is dash fork of.