I am going to come out and say the eBooks WILL be popular in the jewish book market especially among less popular books. Its expensive to publish a Sefer and many Seforim will not be able to be published.
There will be some opposition from the older generation because they did not learn from eBooks, but slowly this will change.
MUST HAVE Seforim like MB , SHAS or Chumashes will always be available in printed form