There's really no choice as to whether or not Total Miner (for the PC) will have mods.
The game is dead in the water on PC if it doesn't support community-made mods. The reason being, why would you want to buy Total Miner without mods when you are one browser-click away from purchasing the PC voxel goliath Minecraft, which has every single mod you could ever want? Playing as Marvel characters, flying around as Superman, ultra-resolution shader mods, laser weapons, actual nukes, you name it.
Without mods, the game is limited in scope. There would be no reason for a prospective buyer to want to buy this game over Minercraft, or even both, when in the buyer's eyes this game would have incredibly less features.
It would be similar to if a First Person Shooter set in a modern warfare setting didn't include multiplayer or aiming down the iron sights. You would never in your right mind buy that game when you could just spend the money to buy Call of Duty, which has every feature the other game is missing and then some. That game simply cannot compete, and Total Miner won't be able to compete without mods.