I found the answer on François Cointe's blog, who publishes weekly comic strips in a major french IT magazine. Here's the translation...

Update: François has posted an english version using my translation. That's definitely more convenient to read. Thanks François!

Top strip:

• Putting Intel chips in Mac laptops because PowerPC chips are too hot, that's stupid!
• Hot Macs, that is great!

Bottom strip:

• If this can make sterile all those that buy Macs to show-off by burning their balls, then that's perfect!
• Shut up! Macs, they are beautiful.
• When you'll be as beautiful as they are, I'll buy you an iPod...

So that's the real reason behind the switch to Intel processors: ensuring Powerbook buyers will be able to have children... who will also buy Macs. A long-term business plan :-)