I wouldn't go so far to say the game isn't solo friendly. I'm a solo player and I understand that if there's something I want I have to use the tools in front of me. Unfortunately the game doesn't adjust for a full fireteam or a single player.
THIS GAME NEEDS SCALING.
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It has it in a sense: if you're 649 and recommended light is 650, you get wrecked; if you're 700 enemies are scaled up to 700. If you mean scale mechanics to one person that would be fun.
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Scale the number of enemies to the number of people in the fireteam. Keep difficulty where it's at. Solo players do enjoy a challenge.