Can't quite tell if this is a serious comment, but to take the stance that a sparse at best network of spotters is sufficient to support the NWS in reporting/confirming tornadoes is borderline ignorant. I have the utmost respect for EM's and spotters that do what spotters should and post up and watch the skies, but to think that if all "chasers" were to go away that there would be no change in the reports, confirmations, or casulties from tornadoes....that is truly holding a high opinion.
This article documents the growing trend in reports of tornadoes in the last 30 years. Much of which can be attributed to technology and the increase in the "hobby" of storm chasing.
http://www.spc.noaa.gov/publications/mccarthy/tor30yrs.pdf
So I guess you're right in an aspect, chasers aren't "needed"... are spotters? Mr and Mrs Smith who live in that farmstead 35miles from the nearest form of "civilization" and Skywarn, EM, or other spotter org. would certainly appreciate the chaser calling in the tornado that is weak enough to not be "classic" on reflectivity or velocity, yet strong enough to change their life in 30 seconds.