I'd take it with a pinch of salt, I remember years ago there was a lot of talk about intel potentially locking down the FSB in addition to the multiplier (which started with the Pentium 2) but it never came to anything.
As for whether intel would do it, I think now is as good a time as any in that they have no real competition for the first time since...... the P2, which is the last time they starting locking things down. By locking clockspeed they could boost the sales of their higher end chips, since even though they are expensive it would leave consumer with no option but to buy them if they want something that fast (rather than going for a cheaper intel and overclocking it, or a rival AMD chip as they could with the P3/P4 range).