We all know EVENTUALLY there will be a champ/champ/champ. It's only a matter of time. Who has the best shot at it? Some potential candidates:
Henry Cejudo- Already champ/champ. Has made it known he wants to fight for the 145 belt some day
Conor McGregor- Already champ/champ. Dana will almost for sure give him a shot at 170 at some point
Khabib Nurmagomedov- LW champ. Could challenge for the 170 belt any time he wants and have a decent shot at it. Could see him one day fighting at superfight at 185 for the belt if he gets 170
Valentina Shevchenko- FLW champ. Lost a couple razor thin decisions to Nunes, could definitely see her getting the BW belt some day. With Cyborg gone and if Nunes retires she could probably get the FW belt too if she wants
Kamaru Usman- WW champ. He's a huge WW, he could easily go up and put on a good fight for the 185 belt. When he's older, with Jones up at HW, he could probably have a shot at 205
Israel Adesanya- MW champ. He has the frame and striking ability to give guys fits at LHW and maybe even at HW one day... but it's tough to envision him getting titles there. Especially with a guy named Jon Jones around
Looking at the candidates, they're actually all fairly unlikely to achieve it. I think Cejudo for sure has the best shot though, he would not be an easy fight for Volkanovski or whoever else is at the top of the FW division. I think he has a much better shot than Conor does against Usman. However if Usman loses the title to a striker, maybe Conor could get it done.
Who do you think has the best chance? It'll happen some day but probably not any time soon.