According to one of the

#77776
Nick -Z.
Participant

According to one of the directors, i forget which one, when they
produced the final episode of season 10, they didn’t know if they would
be doing a season 11 or not, so it’s a safe bet that the Asgard’s
demise was included to give them all that extra cool technology to
exploit in future episodes.

Since season 11 didn’t happen, then
this all appears pointless, however, it may have a huge effect upon
Stargate: Atlantis (which I haven’t been following).