Like everything prices increase, so businesses should take this into consideration when working out their prices.Reseller hosting will always have a demand. As for panel pricing going up, ultimately it affects the market evenly so the playing field is the same with the difference of resellers having pressure to to increase prices across the board.
It is fine to say right I am happy with my prices being $$, but when someone takes out a plan and you say the price they pay is guaranteed for the term of the hosting, then 2 years down the line your own services/panel prices increase massively, but you guaranteed you won't increase your prices to your clients, so now you have goto take the increase hit without any extra income.
so when working out your prices you should be thinking of the future and possible increases that will impact you. and work these into your prices.
yes you can't predict how much increase if any but adding an extra 5 to 10% onto your prices when working these out will help if increases happen and all your competitors are increasing their prices while yours remain the same as you factored in enough to manage the increase.