Having used JupyterLab alpha extensively, I don't think so. JupyterLab makes the 'notebook' one type of document, rather than the only type of document. So it

Having used JupyterLab alpha extensively, I don't think so. JupyterLab makes the 'notebook' one type of document, rather than the only type of document. So it extends Jupyter Notebooks by giving you new IDE-like features, whilst retaining the ability to write notebooks.