On the one hand costs in photography should be going down overall, because there is no longer the expense of film (material, development, digitalisation) and on the other hand competition should increase as the cost of entering the business is getting down (with a digital camera anybody can quickly improve his/her skills as it costs nothing to shoot images). Any thoughts ?

That would be higly unlikely. Professional charges are seldom dictated by the machines the professionals use.

It will not be easier to enter the business. You have to start a company, rent a shop, hire people, etc, etc, ... Thats the real costs - not film - if you are professional.

But - maybe digital will remove the need for professionals. Then we will se fewer of them and they will probably be even more expensive for those that still want to hire one.