I agree with your suggestion that alternatives and new cemeteries are needed. There are plans for one not 6 miles from where I live but the proposal is being objected to because of the loss of greenbelt land.
http://www.your-northwood-hills.co.uk/#cemetryHowever, cremation should also be considered. The families can then scatter the ashes to the 4 winds or in a special place, or they can be kept in an urn for the family to look after, many a grandparent is sitting on a mantle piece somewhere.
But also consider this. My father had been a funeral director for over 50 years. When he retired 3 years ago he had to decide what to do with a cupboard full of uncollected urns of ashes dating back several decades. In that whole time he had written to the families, arranged and carried out other funerals for them, kept in touch with them, reminded them on a regular basis that he still had their dear departed loved ones in storage. None were collected. Last year my parents left London and moved to Lincolnshire, my father felt duty bound to make one last effort to reunite the urns with their families but with little success. So what did he do? Moved to Lincolnshire and took them with him. Now what will I and my brothers do with them when my parents finally die and we have their house to clear? If he couldn't get them back to the families what chance do we have.
Yes this is a subject close to our hearts but we must also remember that when the plots were then and are today purchased it is on the terms of a lease and at then end of that term the land reverts back to the cemetery company. It is in your families interests to keep safe the deeds to the plots and update and transfer the ownership when elderly relatives die.
By all means write and complain to your MP's, local authorities and cemetery companies, join cemetery Friends associations and campaign for this not to happen, but for a lot of families when great aunti Flo and great uncle Jack have left this life they are often forgotten without a second thought.
But when you do discover a family plot though, do you then start visiting on a regular basis, place plants or flowers, remember their anniversaries? With families so far removed from their ancestors these days it's very often not logistically possible. Once you have a nice selection of photos they may never be visited again.
Going back to genealogy and us as genealogists, out of this country's population, we are a small group of people whose hobby does not appeal to everyone and likewise this re-use of graves will not interest, upset or anger a lot of the people.
Dawn