Only pools must be in delegates.
Imagine a Lisk future with 100% pool delegates. Soon a Lisk pool delegate has a problem with his node and his pool node goes down (which happens A LOT). Why should he feel any sense of urgency to fix that problem? There's 100 other pool forgers to keep the Lisk blockchain going, and he's not losing any Lisk out of his pocket - somebody else is. So there's no rush to fix that pool node problem. Then another Lisk node goes down. Why should THAT guy feel any urgency to fix HIS problem? There's 99 other....then 98 other...then 97 other...eventually 50 other....maybe 10 other...hey, who's keeping the Lisk blockchain going? And why? And how are they paying for their computers?
You want 101 people to do their damn best to give Lisk forging nodes 100% uptime? Don't vote pool nodes, vote for people who are VERY STONGLY MOTIVATED to fret over Lisk nodes 24/7/365 for their own benefit. You get what you pay for.
Understand you delegates, you aren't necessary to Lisk.
These are the words of somebody who has never run a Lisk testnet node for months.