Well there is probably a reason Dana White initially regretted letting Arlovski go. As for the current heavyweight division I wouldn't describe it as stale. Arlovski wouldn't last very long because of the talent.
Here's the issue #1 & #2 have cleared out the division.
Overeem is suspended til the end of the year which is another six months or so.
Brock while not the greatest MMA fighter drew PPVs, but has gone back to his roots.
Mir just lost badly.
Mirko Crocop retired.
Big Nog is aging and about to retire.
Big Foot got his ass handed to em by Cain. Personally thought it would be a little more competitive. Werdum also got beat by JDS, but he's the only interesting HW fighter.
Roy is a gatekeeper.
You just saw Kongo vs Shawn Jordan.
Hunt puts on exciting fights, but against any top notch wrestler or BJJ artist and it should be over.
Brendan Schaub has a weak chin and Matt Mitrione is a decent up and comer, but lost to Kongo which shows he's not quite ready for the upper echelons of the division.
Struve is good, but he wins, loses, wins, loses. Although Barry has a wicked personality he belongs in a lower tiered organization.
Russow just lost.
Stipe and Travis Brown are the only undefeated newcomers, but they are still green. Who else is there Lavar Johnson, Morecraft, Herman, Tuchscherer, Madsen, any Death Clutch fighter for that matter are all C grade fighters.
Minus a few others' I just laid out the entire HW division. What other exciting match ups are there we havn't seen yet. Werdum vs Mir, Hunt vs Pat Barry, Big Foot vs Struve
The division needs Cormier, Barnett, Sergei, and Overeem back to make it interesting. If they put in Arlovski it would make some fights entertaining even if he loses. Arlovski vs Hunt, Kongo, Barry, Struve, etc.