Knots only represents 15% of the network nodes..."
Right. It took over 10% of the network in ONE year.
15% is actually a singal.
Discussion
The last major node revolt was UASF in the summer of 2017, and it peaked at about 16%.
Knots is significant. Knots represents a growing frustration with Core unable to admit they are a governance entity. Knots will force Core to react, and that reaction will signal how far along Core is in their understanding that their Bitcoin node implementation is no longer a strictly academic hobby horse onto which they can project their gross incentives and immaterial tinkering.