They should respect the Rambam's (z"l) wishes.

An elaborate high-tech face-lift is planned for the tomb of Maimonides in central Tiberias, even though the medieval scholar decried pilgrimages to rabbis' tombs and even discouraged headstones.

The renovation, according to the Tiberias municipality, will include a glass enclosure for the entire tomb area, which will house a three-dimensional eternal flame. In addition, a powerful laser beam will emerge from the tomb that will reach a height of several kilometers, making it visible from dozens of kilometers away...

He wrote in his great halakhic work the Mishneh Tora that "For holy men, no headstones should be built on their graves because their words are their memory... and people should not visit graves."...
source: http://www.haaretz.com/jewish-world/...ishes-1.428849