Lurker Down South ... Idaho is in the Big West / Sun Belt, not the Big Sky. Its future move to the WAC has no impact on the Big Sky. Only the possibility Sacramento State leaving can cause the Big Sky to make any moves.
Idaho had a prayer answered when UTEP left for ConfUSA. If LaTech had gone to ConfUSA, Idaho would have been stuck in the Sunbelt, and the Idaho politcos would have been steamed because of all the money they would have spent on travel, with few local games. Barring a WAC invite, the only other option for the Idaho administration was to swallow their pride and drop back to I-AA. The Big Sky would surely have accepted them in a minute.
Northern Colorado does place a high emphasis on baseball, but that does not preclude the possibility of them joining the Big Sky, as they can obtain baseball affiliate membership with another conference. For example the WAC will be down to five baseball teams and would almost certainly be interested in asking UNC for that sport.
Expect a Big Sky invite to be issued soon, maybe even this month, to Southern Utah. Montana had been stonewalling SUU's invitation, but that may have changed now. Weber St., UNA, Sac St., and Idaho State are all believed to be firmly in SUU's camp.
IF SUU leaves the MidCon, expect invites to go to TxAM-Corpus Christi and UTPA. Corpus Christi's AD and President expected the last MidCon invite to go to them, but were surprised when it went to Centenary instead. Oral Roberts and Centenary are now believed to be strongly in favor of the Texas schools, especially now that Corpus has a brand new arena. The Denver/UNC combination is possible, but Denver would have to voluntarily leave the Sunbelt and go to a weaker conference. Denver's best bet will be to bide their time and wait for a better offer. NDSU and SDSU main problems are that they have no natural advocates in the MidCon. If the midwestern schools wanted another school, they would chose IPFW.