Grasmo,
In my opinion, no. I don't expect the price differential between gas and diesel will continue to grow. I know of no reason why it should.
Diesel engines, because of their enormous torque at low rpms, will always be the choice for moving heavy loads like in OTR trucks.
Longevity is another reason why gas engines will not replace diesels. Few TDR members and few Dodge Ram owners ever actually use the life of a Cummins diesel. Most tear them up with radical mods and racing or grow tired of the truck and buy a new one long before the engine is worn out. The Cummins is actually a million mile motor in a Dodge Ram. I know one TDR member/RV transporter who retired a '95 with 930k on the odometer. Have known others who have put 600k+ on one. One of our TDR members, GAmes, has almost 600k on his '97.
And third, resale value. During normal times even a rough, high mileage Cummins Ram will sell for a good price because buyers looking for a good, cheap work truck know what they are capable of doing.
I believe diesels are here to stay. I'm not about to sell or trade mine. I'll grumble when I fuel up like everyone else but I'm committed.