There is no benefit; you would be able, later on, to complete a post-Master's certificate to become an NP, instead of starting from scratch and doing an entire second MSN, but that would still be additional time, expense, and effort. Surely you're aware that there are scads of direct-entry NP Master's programs out there? What would be the appeal of a general/generic MSN for you?
BTW, direct-entry MSN programs aren't "replacing" accelerated BSNs -- they were around long before anyone ever thought of an accelerated BSN program. It's the accelerated BSN programs that are new.
Since you're asking for advice (in the title of your thread), I would encourage you to pursue basic licensure and get some real experience as a nurse (observing the larger world of nursing first-hand) before making a decision about wanting to pursue an advanced practice role (NP or any of the others) -- I've known quite a few people who went the direct-entry MSN route because they thought they wanted to be NPs, CNMs, whatever (with no nursing background or experience), only to find after they had invested the time, $$$, and effort in the education, that they didn't like being an NP/CNM/whatever at all. They ended up heavily in student loan debt, seriously unhappy in their choice of jobs for which they were qualified/credentialed, and frantically trying to figure out what else they can do for a living. That's certainly not the case for the majority of direct-entry students, but it does happen.