I used to think like you, until Scipio provided me the data. Now I have an even more cynical view based on my personal experience: the higher prices will indeed entice some people from High Sec into their first Low Sec belt ratting foray, as the spawning rates do support the market. But they’ll get blown up for their first time instead of High Sec, and first learn about D-Scan in Low Sec. They will complain to CCP about how dangerous Low Sec is and send nasty Eve Mails to their killers.
CCP, ever in their quest to ease the burden on the complaint department, will make Low Sec safer.