The job is not to replace Markov but to have a good moving puck D with some offense. Romanov might do that job some day. The job is not to reproduce the team we had between 2005 to 2018. We didn't win any Cup those years and we were out of PO pretty soon. Markov wasn't the best warrior in PO by the way. Even if MB replace Markov, Koivu, Higgins, Hamrlik, Ryder, Theodore and Zednik, we will not be a winning team.
The job is to win the Cup and it might be in building a team differently than before. Even in the best of 2003-2018, Habs never had wingers like Anderson and Toffoli and they never had young centers promising such as JK and Suzuki and a future snyper such as Caufield. Yes he will need a good moving puck D. There are some interresting D in the future and MB proved he can do trades. MB or another GM, getting a offensive D is possible.
Did you start watching the Habs yesterday? Bergevin had almost 9 years to find a replacement for Markov and you're talking "someday", we did not have a replacement in the minors when he took over in 2012, and other than Sergachev whom he traded in a useless and unnecessary trade, we had no one close to stepping in by the time Markov's contract was set to expire. He also did not acquire a suitable replacement via signing or trade. We've had nothing bug a revolving door of mediocre defensemen for almost 5 years.
Win a cup? We finished 24th, 14th, 28th, 7th, 22nd, 2nd, 9th, 4th ever sine he took over, what part of those placings screams contender to you?
You keep talking about "the future", none of those prospects has made it to the NHL yet, nothing is guaranteed. They do not count as replacements that were needed for at least 5 years.
Never had promising young centers? wingers like Anderson and Tofoli? Whose freakin job is it to get those? Who went and got us Schlemko, Hemsky, Alzner, Briere, Semin, Streit 2.0, and the just goes on and on...instead of getting the Toffolis and Andersons of the NHL?
Bottom line, he has failed to trade, draft or sign a puck moving LD for almost 10 years. This trade is just another example of his crap shoot gambles that do not address a need.