Some people want to, but most probably don't because of the increased number of tones. Four + one neutral tone scares people like you can't believe. Thinking of more is seen as an impossible task (even though thats not the case

I want to learn both. I think Cantonese is just as good to learn. Yes Mandarin is very popular but I remember before 2000 you never heard mandarin spoke in the UK or in China towns, now you hardly hear Cantonese

Because i think is difficult xD!

我識講小小 ... I want to learn more Cantonese though. At the moment I'm studying Mandarin, and I think it would be confusing to try to learn both at the same time. So next year, if my Mandarin is better, I want to study a lot of Cantonese :D As for other people, there are many people who learn Cantonese. But more people learn Mandarin, Japanese, French, German, Spanish, and so on. Maybe there's a fear that fewer HKers are speaking Cantonese, so some people think it's not worth learning in the long run. I think this is wrong and a shame. Cantonese is a great language :D

Because kung fu movies are not as good as they were 20-30 years ago.