In order to keep this trendline intact the advances must "keep on keepin on". But with definite signs of momentume waning, there will be a stopping point. I do prefer log scale for such things. Although at this point its close either way even on non-log.
A break of these up-sloping lines will, at the least, result in a very good pullback time and time again. In a bear market, they signal a trend change.
The NDX chart provided is just one example provided. The blue line is even more resistance. I estimate the qqqq's stopping point would be $41.85 if the NDX manages to hit this blue line.