Sudeep was in Sye Raa but what was it's Kannada version collections?
There is no chance of Dabangg 3 doing 50cr in it's dubbed versions. Such miracles don't happen.
As far as your hopes from Kannada goes, the more weaker Sudeep is shown to be against Salman, that much quickly Sudeep fans will walk away from D3. And for the rest there is literally no reason to watch Kannada dubbed version & target audience will watch the Hindi version only. The true blue Kannada audience have not seen Dabangg 1& Dabangg 2, so how can you expect them to watch Dabangg 3 without even being attached or having any sort of liking towards Chulbul Pandey the character?
All I would say is keep your expectations in check.